gm_id methodology transistors

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vinogunasekaran

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can anyone please help me why the transistors are treated as width independent figures wile we extract values from cadence for gm/id methodology.
 

Probably because just the W/L ratio is important?
 

gm = Id/2(Vov)

for a constant Id, if u increase your W/L you overdrive(ov) voltage deceases which leads to an increase in ur gm and therefore gm/Id.
You can understand it like this.

so HIGHER gm/Id belogs to large transistors (high W/L and low Vov)

But also your current can change and in order to compensate it again you have to play with W/L and ov voltage.
 

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